Q.

With regard to gastric acid secretion, all the following are true EXCEPT:

A. acetylcholine stimulates secretion
B. both G protein and direct calcium channels are involved
C. an H+ - K+ antiport transports H+ into the gastric lumen
D. parietal cells have high levels of carbonic anhydrase
E. acid secretion is maintained at constant levels by local feedback mechanisms
Answer» E. acid secretion is maintained at constant levels by local feedback mechanisms
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